基坑围护结构变形模式对地表沉降的影响

Influence of Deformation Modes of Retaining Structures on Surface Settlements

利用三维数值分析方法,在考察计算范围和边界条件对计算结果产生影响的基础上,把围护结构变形模式加以简化,探讨了不同的围护结构变形模式与基坑四周土体沉降范围、沉降分布形式以及沉降最大值和所处位置之间的关系。经分析发现,围护结构变形越向下发展,引起的墙后土体沉降范围越大,沉降最大值的位置也越向远离墙体的方向移动,而沉降曲线呈越来越平缓的趋势。同时,围护结构变形扫掠过的体积和墙后土体下沉量具有某种相关性,扫掠过的体积越大,墙后土体下沉的体积也越大。

Based on analysis on the effects of calculation extents and boundary conditions on the results,the paper simplifies the deformation modes of retaining structures and studies the relationships between different deformation modes and surface settlement extents of soil,modes of settlement,maximum settlement and the location of the maximum settlement. The results indicate that the lower the deformations of retaining structures develop,the larger the surface settlement of soil caused by it extents , and the farther the location of the maximum settlements is away from retaining structures. Besides them,the results also indicate that the surface settlements of soil behind retaining structures are related to the deformations of retaining structures.